<?php include 'inc/header.php'; ?>

<?php
  $name = $email = $courseName = $content = '';
  $nameErr = $emailErr = $courseNameErr = $contentErr = '';

  if (isset($_POST['submit'])) {
      //验证姓名
      if(empty($_POST['name'])){
        $nameErr = "姓名为必填项!";
      }else{
        $name = filter_input(INPUT_POST,'name',FILTER_SANITIZE_FULL_SPECIAL_CHARS);
      }

        //验证邮箱
        if(empty($_POST['email'])){
          $emailErr = "邮箱为必填项!";
        }else{
          $email = filter_input(INPUT_POST,'email',FILTER_SANITIZE_FULL_SPECIAL_CHARS);
        }

        //验证课程名称
        if(empty($_POST['course'])){
          $courseNameErr = "课程为必填项!";
        }else{
          $couseName = filter_input(INPUT_POST,'course',FILTER_SANITIZE_FULL_SPECIAL_CHARS);
        }
        //验证评价内容
        if(empty($_POST['body'])){
          $contentErr = "评价为必填项!";
        }else{
          $content = filter_input(INPUT_POST,'body',FILTER_SANITIZE_FULL_SPECIAL_CHARS);
        }


        if (empty($nameErr) && empty($emailErr) && empty($courseNameErr) && empty($contentErr)) {
          // 添加到数据库
          $sql = "INSERT INTO review (name, email, course_name, content) VALUES('$name', '$email', '$courseName', '$content')";
        
          if (mysqli_query($conn, $sql)) {
            // 成功
            header('Location: reviews.php');
          } else {
            // 错误
            echo "出错：" . mysqli_error($conn);
          }
        }
        
  }
    
?>

    <img src="https://img0.baidu.com/it/u=3510319904,2980310042&fm=253&fmt=auto&app=120&f=JPEG?w=380&h=285" class="w-25 mb-3" alt="">
    <h2>课程评价</h2>
    <p class="lead text-center">为你所上的课程留下评价</p>
    <form action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']) ?>" method="POST" class="mt-4 w-75">
      <div class="mb-3">
        <label for="name" class="form-label">你的姓名</label>
        <input type="text" class="form-control <?php echo $nameErr ? 'is-invalid' : null; ?>" id="name" name="name" placeholder="请输入你的姓名">
        <div class="invalid-feedback">
          <?php echo $nameErr; ?>
        </div>
      </div>
      <div class="mb-3">
        <label for="email" class="form-label">你的邮箱</label>
        <input type="email" class="form-control <?php echo $emailErr ? 'is-invalid' : null; ?>" id="email" name="email" placeholder="请输入你的邮箱">
        <div class="invalid-feedback">
          <?php echo $emailErr; ?>
        </div>
      </div>
      <div class="mb-3">
        <label for="course" class="form-label">课程名称</label>
        <input type="text" class="form-control <?php echo $courseNameErr ? 'is-invalid' : null; ?>" id="course" name="course" placeholder="请输入课程名称">
        <div class="invalid-feedback">
          <?php echo $courseNameErr; ?>
        </div>
      </div>
      <div class="mb-3">
        <label for="body" class="form-label">评价内容</label>
        <textarea class="form-control <?php echo $contentErr ? 'is-invalid' : null; ?>" id="body" name="body" rows="4" placeholder="请输入你的评价"></textarea>
        <div class="invalid-feedback">
          <?php echo $contentErr; ?>
        </div>
      </div>
      <div class="mb-3">
        <input type="submit" name="submit" value="提交评价" class="btn btn-dark w-100">
      </div>
    </form>

    <?php include 'inc/footer.php'; ?>